海水源熱泵用雙螺旋管海水換熱器傳熱特性的研究
[Abstract]:Combined with the current situation of energy shortage in coastal buildings in China, the sea water source heat pump system with high efficiency, energy saving and environmental protection has important research value and application prospect as the cooling and heat source of coastal buildings. Therefore, a new type of double helical tube seawater heat exchanger for sea water source heat pump system is proposed in this paper, and the heat transfer characteristics of the heat exchanger are studied experimentally and numerically. Based on the characteristics that the sea water temperature is close to the freezing point temperature in the northern coastal area, this paper not only studies the heat transfer characteristics of the heat exchanger in summer and non-icing conditions in winter, but also focuses on the heat transfer characteristics of the freezing condition in winter. Firstly, the mathematical models of double-helical tube seawater heat exchangers in winter icing, non-icing and summer conditions were established, and the performance test system of double-helix sea water heat exchangers was built in Tianjin International Cruise Port. The temperature distribution along the tube length and the ice thickness distribution along the pipe length were measured under the above three conditions. The experimental results are introduced into the corresponding mathematical model in turn, and the convection heat transfer coefficient outside the tube of the heat exchanger is solved. The variation range of convection heat transfer coefficient of the heat exchanger outside the tube during the test period is obtained: when the seawater velocity is 0.07 ~ 0.38 m / s in winter, the corresponding convection heat transfer coefficient is 427.8 ~ 712.8 W / (m ~ (2) K), and the sea water velocity is 0.21 ~ (0.53) m / s under freezing condition in winter, and the corresponding convection heat transfer coefficient is 712.8 W / (m ~ (2) K) in winter when the water velocity is 0.07 ~ 0.38 m / s. The corresponding convection heat transfer coefficient is 582.8~853.9W/ (m ~ 2 ~ (2) K), and the variation range of convection heat transfer coefficient is 451.7N ~ (762.4) W / (m ~ (2) K) when the variation range of seawater velocity is 0.09 ~ 0.47 m / s in summer. Secondly, by using the mathematical model of double-helical tube seawater heat exchanger in summer and winter icing and non-icing conditions, the heat transfer characteristics in seawater are simulated and forecasted, that is, the tube length and diameter of the heat exchanger are studied by numerical simulation. The effects of flow velocity, inlet temperature and seawater temperature on the heat transfer characteristics of the heat exchanger were studied. The ice formation law of the outer ice layer and the effect of ice formation on the heat transfer characteristics of the heat exchanger in winter were simulated. Finally, taking the sea water source heat pump system used in an office building in Nanjiang Port of Tianjin Port as an example, a detailed selection method of double helical tube seawater heat exchanger is given and the economy of the flow velocity in the pipe is analyzed. The Energyplus energy consumption simulation software is used to simulate the annual load of the office building. Taking the life cycle cost and cost annual value as the evaluation index, the sea water source heat pump system with direct water intake mode is selected for the office building. The economy of the sea-based water source heat pump system based on leachate mode and the sea water source heat pump system with double helical tube seawater heat exchanger is compared and analyzed, and its energy saving and environmental protection benefit is evaluated.
【學(xué)位授予單位】:天津大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2015
【分類號(hào)】:TU83
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